As an update, I was able to finalize this project, i have a fully working ZX80 emulator with proper sound which can load almost all kind of tape files, can save/load and more.
I was able to port the FUSEemulator and libspectrum on my Vu+ Solo4K
I hope to be able to generate all required packages in the next few days, for anyone interested, to be able to install the emulator and create a small plugin to start the emulator under enigma2.